Blocking IP addresses from the server

I really got tired of dealing with spammers so I just started blocking IP address from these people who just want to submit garbage to our forms on the websites.  Here is how I block and IP address.

1. Log into the root account.

2. Enter the code below at the command prompt:

iptables -A INPUT -s x.x.x.x -j DROP

To list what is in the iptables:

iptables -L

That is pretty much it, and they should be shut-down from the server completely!